With the name, I half expected something related to the Soviets (yes, I know that's the CCCP, not CCCC, just roll with it). Overall OK. The tense feels a bit iffy, switching between present and past. You're missing your Addendum 1. The photograph is rather meh (ideally, if you could something involving the insects swarming out of the clothing, that'd be for the best. You might be able to rig it through photo compositing or by forced perspective involving some clothing and a swarm of something like gnats or bees). I like that he's not indestructible. The sudden disease outbreak was a bit abrupt for me. Kind of felt like "Eh, he's safe. He's harmless, he's BEES! SLEEPING SICKNESS, ACK!"

It's like a more horrifying version of Oogie Boogie from The Nightmare Before Christmas. I like the idea of a person replaced with something non-human. Much like DC's Swamp Thing contains none of his original identity and is now just walking mud and vegetation, this takes that in a similar direction but insects are actually much creepier.

The only thing I'd add is something weirder or stranger than making people sick. The ability to write and communicate gives you a whole lot of options to play with. What does it say? What does it want? Is it a former-human cursed to a horrific existence, or a malevolent force intent on spreading death and disease? You don't have to be explicit, but give enough of a hint to the reader to get his or her imagination going. The scariest SCP's are the ones that keep me awake trying to figure them out.